Johnson and the team published a study based on research of pro-IS posts Russia-based social network Vkontakte between mid-2014 and August 2015, Pam Belluck wrote.
Researchers focused on small groups to monitor new activities that could possibly lead to information on future acts of terrorism, the study said.
The study further revealed the formation of small groups accelerated prior to an attack on the Syrian town of Kobani which could set a precedent for future prediction of ISIS-related incursions.
Johnson told the Times the equation used data on small groups to predict the Kobani attack.